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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c827eb2d0cbcbf05bfbae299637263eaf399843492b92a3851e9d1f45247723' 
  AND token = 'd3A/s+TTcRqnenoKm997oqq/aC1fTRjQjA/lQkc4fDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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