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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69b1cc4087940234d1f15a5b5a6d8aefd8276e3461a76ad691a04c5d71d6f93' 
  AND token = 'jvSjxV6JXgdmOn5En/mDC3NQD0XSII3S7Xcow4NhSJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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