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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd58b5fd25274c8e2a7cca673fda78a711d108d69e8da0693722e4d7ca8924b' 
  AND token = 'LaRTeb6kkg70Rk4Gh73yzA7dnCpF0T3fm5fqMW23h0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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