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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ba6bef2bd5fb8a3169c6b0f9e55a3f2f03c6ae8953fb6eacc5fae88fd1dac8' 
  AND token = '/s+eQdrLRGCQVsYilaWTR5BNBV7YRa95buYIxj4Shms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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