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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e5d02b8f2a07c89a94ae14a862ae2573c19fd989f15e53c6d75beebf60806b' 
  AND token = 'A96XCEektTJmn12bPCen14nQpwB0pZYNSd70QKCxyBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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