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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048bf1a8346be518237bc346c66f1c9a777a658c225344d01dfe86ba5cf076cd' 
  AND token = '4n25383ibl4VEEdwjbJ/ru/PwiO8R2K24953hWK6gZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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