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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d84e341c7feeb799558cb2d4232db9c3e49bbade0e28b3c797c70161225d5e3' 
  AND token = 'BwM0G42PuUb+5DVAir/o5oIjZJm0+sERByK3P+s+unc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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