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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09528f0d9d4a0d009e139491a7dfe812078c871c6eccc6ec4e7efdff938e75b' 
  AND token = 'cWNgsyiREI/xF0WM1Dvz1krEuBW3ebd6FrvG7N/wooQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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