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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3d11cbbe78f807dfa0ed05ad0f07d2f899f2e6010706eccfd48cb9b31fd36e' 
  AND token = 'nyamMasPvPg7VGGRH5DYDTu8B98EB1OkkEzSXn7/s7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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