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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eca9b985ecb0dcdb0c3e9059ba1635ffb2eede04a6a9fb4d7630cd7eeab3cb6' 
  AND token = 'UUViNgWMHFIp6HQno7HoOJR2VlRU+C5Ilcm2jnT5gwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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