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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153a57c1888e3f59f2b89f35c84335820674b8f970be634ae7ff2a863cc4cbcf' 
  AND token = 'lNDGZtleDPqfC1uoL1jJIJoxoH+jVYV+03DicYJp+6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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