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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613c517e6480318baaea1e8c7244a56fb305ef3c002df3f6d00632b9a1819cd4' 
  AND token = 'p9WEpPB1VVq+t+kG9Ls9oSW4PMPFCGCmo2PxIbTNuOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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