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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c50e3067b9744107e05369e4952dde351d5694d6bc853abb01344186c19b5e' 
  AND token = 'yly0vk/SNdy0rCmC4+C8iEQmqxLU5cD04d0D4aqDe1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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