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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fcb5c87e8a412f58efc49bf02d8047a8bf3d0602e2bcc2bf1165b78b19b4ba' 
  AND token = 'LxcnhpalCgcu/PzRIe5cXehkah3wPoFEbZwp8W1+884=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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