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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95dc95071e7c39a9a88f709763ec4b473aac32fd4e7486db1ab49251cf3e4582' 
  AND token = '/jtETaQhSUaVQcVQ6FrNJHMvtowKY5GaoDXstYPydYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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