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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f5d1a558f3e7ced12cc11b26218b465002bd8a9f2db437371091c05cf0a115' 
  AND token = '6YSf+sX3R5698kzK16X9EwCZ6KKa54RLFS7KairSwmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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