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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd9304e0b0e0aee5de83069373d2f954387d7fe42e3bd895cf3a78f1a54aebd' 
  AND token = 'jQvPEBrL3Pu8Ver/GGa8QIB8kk+sqq08uQACCft4dgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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