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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '125e817eab98ba9dc0518173b5ae771379009931c127409a18b78c30d26d1380' 
  AND token = '71xKp0ymt3m7jWhoLWDuNZgcBvXgMP7RHq/5LMpeawc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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