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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0dc3b4e11b4a285891d84ac47c8af1e5fa8cd9c0d6b7468e4e41e84393775c' 
  AND token = 'tHCcDLhAWegcfT0OGUlL9RFtD6JQ8T3UhOmU7JYqhpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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