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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089c80bd4eebdf6b94b0367adaea87917ce4c754727c3b48a237e7bd71e91e74' 
  AND token = 'ksNX511RpXuBqM8Pn1rYy4KIKlP5mKpYm6j2l8Em9qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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