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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2731c87cd8f790619a5a069d989ea621f3c0f0430b49bdf4e661479d427791ee' 
  AND token = 'o1m0VDhmt44aEb5/D+s495+ohC76w9YRrClvdmb5lUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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