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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2404841b002b173d84a94e8f8bdc6448641371861a0df5522a53d980fdd92d' 
  AND token = 'TOfvtA1XBXmJM21G3pdHd4Mu8qt8WFLriFsdaSwF3qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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