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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d3dd8b69ff2822fbbb656672c6609b9c1699c18a21fa08b59a36e9ab6c6a07' 
  AND token = 'SJFmnmteHgV0WOkMJOSissl775iaUbHO0Jhdwz/OG1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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