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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1de0614ba4e779ff9d7172624af6b32fe80c8e9ae2595d38ef5034cd52269a8' 
  AND token = 'Rftp9VWigXWZVOT2zVIfL0TeYLTkuEpm3NuGhUztmt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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