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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099d7eefe8d2faaf3abfaf02e26f3ca15102007268bb6426786b4bf410b380b0' 
  AND token = 'elzow0jJaRI768wenH8PJQxaqlzMjj/Vof/MkCz2YoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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