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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a938c595ddaaa1622fd515547a0d528e4109ba1d16c0d23de32565246c9fc30' 
  AND token = 'n8VB2dxcesR6XEmUIwU390Zf9QyYSoKllk/+60TzYLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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