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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b5d4d2864cff841f9ded6c5400de38ab214eeeca6d9bf810838d9055b37490' 
  AND token = 'wsw3YyXjI2QJ0NJIHpQVJIzcPYx5vNAeHWsAiMwZFPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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