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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd594e6d62b8fef8e2c8bd7267807114dc2f88ff9cfeaf6ea6caafa8a70f0f6' 
  AND token = '5K5ffAtCakr+8waN0xO+gAC35X9oavHORsPtDZUgJoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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