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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b4550ec044389b9fab4dcf4ffcaf3b86f86fc904b9aa92a91e354cb94c834a' 
  AND token = 'wVaA+8SyfJsqrcahlh9i5fxMDcHlYhYv70XrvLOni08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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