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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739d3de163cba6110fa93611456c35a79f193ad237f75fab572539ca27a09deb' 
  AND token = 'd4psYSPYHENFIzRLRwngH/pkGW2CtFFN37CutdcMRLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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