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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb155e1df9330a5ddc2c74784adecd61ff6887168a1d8c704cb8af9778d0f06' 
  AND token = 'GCd6pJQ3t26tY2JEl0hL9rWxgwdBa1Jh6KgVClPaNL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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