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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a33e2660403ef86896b4397a72977b0fd445f4a6f6804f0b355db8535e90c6c' 
  AND token = 's2WRJPlHiXYbm5hUXJKYzX77agkcqk0Oz1PettUi9xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}