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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae88a29d0e3ced42e9aff78c4d6b824cdb5d97914a9b8e774bcc8f0a655fe14' 
  AND token = '1+2dZix6kZBb5WLeIiMNCxeh7YCLMn34p8uvFTpBYd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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