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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba77c7a92a6c179097a8790d4b48ee030e536525e201d8868f4eee0e52397d38' 
  AND token = 'VXGIbsJNXehCRN3QVy+vl3/WUdE4zA7JaojaM9z8knQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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