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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f16c4b975c38849d3a7d610282635e94be7da281978442a6b6e1f966ce9b696' 
  AND token = 'LFFDM7xIEIYopzkDRVnCX1cgRbzNWE10hsHlY7R4Nvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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