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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55bada4d1c891a4ae5949b5195076acac7afcf190e22578ff35834f0ab89fed' 
  AND token = 'iRfdAl3tKzTW17toOP1kd/EH9gz8pZ58NkVk4nc70LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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