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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e710c4bba6e99977d69ed63a8f73371feb2458106c813a93143779f13733ea' 
  AND token = '4E7ZWr8hEMTfvFEE4JHz1HQZU+SheDto/ViV41ePMrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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