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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3b7b8cbbdc4cbd7dffc803be1069a78d3b224a334a17ec9d9d7b79d4db2268' 
  AND token = 'BBhApjXk48q3uZtNao+4tIcJA2DHz7zBme/pAHpjT9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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