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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09b8f6d3a639365a1af5a39e8f5ea0f119a5b07a5919c8adf6d5d21f7e930f5' 
  AND token = 'm1ps/rdAdIOQ6Hk2AjczQ+1tWCAX8mHJmY4BhYRpdag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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