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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a676cd8526db7ccb0eaf12d0e6293adda29b6a679705e6622500fc624fd50e95' 
  AND token = 'Reroc68YLTfCopc9DSw1T37a2xlB7i/N9htFSwK2YAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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