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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429a71db05320d91199c5f898852e4e2d42ab9aa24bf0f218407404fb1c689dc' 
  AND token = 'k1nV0p5ybQdge0i0lMYC4IAbzccF7m+uU963U3wfLjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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