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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13499b5cc590a4d344b0778336cf9e12fcc69fec30bf5327321218541572290c' 
  AND token = '0/yFsst1N4Lo5MfqKWypMgSQ+roPgB2l5zsqYp2glT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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