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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77857b7496c94802b7e0eac37a5466719b5f75e1a58ae48a2fb0f80ee17c1d59' 
  AND token = 'XPJyGzxr8P3aVCz+uzILhiyauFSmft8uKCxPVog2DCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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