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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2af141c82d24756b667db476ac3aadfbc26bf95788acbdd95b71a40b68ba3a4' 
  AND token = 'NdeiEw6O4l5dILDv9CxibJvmzIQ5i7k4OJdRiyQ9KJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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