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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa63a7b3074ec7eb3a6deeae71b51a5289105417f501d3aebc68e7881933e35' 
  AND token = 'ypkYzCFTXCLeH9d1bxWfdKAs56SVTWpFYCX3+rCV/gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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