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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a2efe64819bc9d0cbdf679ea8999a751b19ff1de9e0ec3c89df55dcdf22326' 
  AND token = 'anRUUmvQPKbrPJrw7gTrcX5I/Ya76r306HQMUsRC/fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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