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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb732811e6d27a89fc510ad58535c25419d84548be9b5db43b817b2542edd53' 
  AND token = '2jyseHAD3HAh5anxuY8pSEjQoZdUOUjYvsD1YNtoYVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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