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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5094b2d3a990937ee4e0b8e1a0917a50e4f857df6a4b2cfb3a65553e5ed7f11' 
  AND token = 'izwxZ99hA+WQgaiclxEUo19BvJO88I9+Buk6hUAJNEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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