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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92fd910195ea5ee648b0188aa1c8bd787ff7f906a0a7835e523d65e5710324f4' 
  AND token = 'KT601Y7HmX81spVKswPZHyFdTp99GjiVOOoHwU+0NGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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