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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4976e9b18bb611dbb86639b8969940cfee27cf7dc43c5fff1118db26bfc71a' 
  AND token = 'mtOPNWehOzLzBRWAdF22+98+dqnnD+xW3fC+5329HJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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