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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9878cc13d13f4662cd19fdcd7c14e6cd12e25e35732112c1a45a7c0c668fc1c1' 
  AND token = 'yC+zZblravwwfWz977jTdglHbfkUm0qB5r8+IxqzIWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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