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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d00b020d820cfe30af2599d0b7e6782c953801c1ab95a0bc4c6608639053d37' 
  AND token = 'x2Kd7FSMC/0DBPP176JB53HMbMlpSedqcy4kw/RLN4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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